کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1442493 | 1509446 | 2010 | 4 صفحه PDF | دانلود رایگان |
We investigated heterojunction organic field-effect transistors (OFETs) using pentacene and hexadecafluorophtholocyaninatocopper (F16CuPc) as double active layers. Two operation modes including depletion- and ambipolar-type were observed depending on the deposition order of two organic films. Depletion-mode was firstly observed from that devices with pentacene as the bottom layer and F16CuPc as the top layer, which was attributed to dipole effects originated from the pentacene/F16CuPc interface. Then improved device performances were obtained with mobility from 0.87 to 1.06 cm2/V s, and threshold voltage shifted from −20 to +25 V as compared with conventional pentacene-based devices. Furthermore, the heterojunction OFETs exhibited typical ambipolar transport when alternating the deposition order of two films, which exhibited ambipolar mobilities with 0.06 cm2/V s for electron and 0.0025 cm2/V s for hole, respectively. All results implied the utilization of heterojunction can effectively improve the device performances of OFET, and operation mode strongly on the deposition order of two films.
Journal: Synthetic Metals - Volume 160, Issues 5–6, March 2010, Pages 475–478